Electrodeposited white bronzes on brass: Corrosion in 3.5 % sodium chloride solution. (October 2020)

• Record Type: Journal Article
• Authors: Berretti, E.; Calisi, N.; Capaccioli, A.; Capozzoli, L.; Hamouda, A.M.S.; Giaccherini, A.; Giurlani, W.; Ienco, A.; Martinuzzi, S.; Innocenti, M.; Waware, U.; Virtanen, S.; Zangari, G.; Ahmed, R.; Lavacchi, A.
• Is Part Of: Corrosion science. Volume 175(2020)
• Publication Date: 2020-10
• Subjects: Bronze -- Electrodeposited films -- Marine corrosion -- XPS -- XRD -- SEM; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.108898
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Electrodeposited white bronzes are cathodic coatings for brass in seawater. Zn-free white bronzes show larger resistance to the anodic stress in comparison to the Zn-bearing. Zn-free white bronzes show localized corrosion while Zn-bearing corrosion is uniform. The Zn-free and Zn-bearing coatings show limited differences in surface morphology and in colour . Abstract: White bronzes are electrodeposited coatings applied on brass as surface finishes. We report a comparative study on the corrosion resistance in chloride aqueous environment of two white bronzes, a Zn-bearing and a Zn-free. Corrosion tests showed that both materials provide protection to brass, but the Zn-free is more cathodic and performs better in the test environment, following a different corrosion mechanism. We also explored the effect of the coating thickness on the corrosion parameters. We found that the more cathodic OCPs were achieved with coatings exceeding 1 μm, while the 0.5 μm coatings show OCPs closer to the brass substrate.